81000101 has 8 divisors (see below), whose sum is σ = 99692544. Its totient is φ = 64087920.

The previous prime is 81000083. The next prime is 81000107. The reversal of 81000101 is 10100018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81000101 - 2⁶ = 81000037 is a prime.

It is a super-2 number, since 2×81000101² = 13122032724020402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444965 + ... + 445146.

It is an arithmetic number, because the mean of its divisors is an integer number (12461568).

Almost surely, 2^81000101 is an apocalyptic number.

It is an amenable number.

81000101 is a deficient number, since it is larger than the sum of its proper divisors (18692443).

81000101 is a wasteful number, since it uses less digits than its factorization.

81000101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890131.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 81000101 is about 9000.0056111094. The cubic root of 81000101 is about 432.6750509282.

Adding to 81000101 its reverse (10100018), we get a palindrome (91100119).

The spelling of 81000101 in words is "eighty-one million, one hundred one", and thus it is an aban number.